What is FlightAxis Link? I'm going to simply copy & paste Jeremy Sebens' post from the new FlightAxis Link forum, which you can visit for more info.
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Knife Edge software is pleased to release FlightAxis Link. This is a beta feature for RealFlight 8, and allows you to connect to the simulator over the network. This allows for autopilot development, creation of training environments for your flight control systems, and any number of other applications.

This technology has been in use by a group of ArduPilot developers, resulting in some exciting new flight modes. We are looking forward to seeing what else can be made with it.

Watch this spot for more information. If you'd like to sign up for an unlock code, check out the product page: FlightAxis Link